Add explicit and make public headers compile with -Wzero-as-null-pointer-constant

... or equivalent.

QtBase 5.6 headers already compile that way, so let the other
modules follow suit.

Cleaned up placement of * and & in parameters as a drive-by.

Added explicit where it was missing as a drive-by. This is
not a source-incompatible change, because code that breaks
by this is a bug. Let's not have this sitting around in an LTS.

Task-number: QTBUG-45291
Change-Id: If81ed0c71393aee21d347f5ade4bf3fcc07cd82f
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/multimedia/controls/qimageencodercontrol.h b/src/multimedia/controls/qimageencodercontrol.h
index f448754e6..6dccd966e 100644
--- a/src/multimedia/controls/qimageencodercontrol.h
+++ b/src/multimedia/controls/qimageencodercontrol.h
@@ -62,13 +62,13 @@ public:
     virtual QString imageCodecDescription(const QString &codecName) const = 0;
 
     virtual QList<QSize> supportedResolutions(const QImageEncoderSettings &settings,
-                                              bool *continuous = 0) const = 0;
+                                              bool *continuous = Q_NULLPTR) const = 0;
 
     virtual QImageEncoderSettings imageSettings() const = 0;
     virtual void setImageSettings(const QImageEncoderSettings &settings) = 0;
 
 protected:
-    QImageEncoderControl(QObject *parent = 0);
+    explicit QImageEncoderControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QImageEncoderControl_iid "org.qt-project.qt.imageencodercontrol/5.0"